[css-align] Prepare for WD

Author: tabatkins

css-align/Overview.bs

@@ -4,7 +4,8 @@
 Shortname: css-align
 Level: 3
 Group: csswg
-Status: ED
+Status: WD
+Date: 2014-12-18
 ED: http://dev.w3.org/csswg/css-align/
 TR: http://www.w3.org/TR/css3-align/
 Editor: fantasai, Invited Expert, http://fantasai.inkedblade.net/contact